Add sequence view pan and zoom

[ivan-aksamentov]

Resolves #34

It is useful, in particular, to see mutation markers that are close together.

• horizontal zoom and pan (horizontal scroll) in sequence view
• hold shift to zoom with mouse wheel
• rebase on current master
• figure out edge cases
• figure out how pan and zoom interact with each other
• limit scrolling and panning to some reasonable range
• add reset button

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[rneher]

To make this useful, I think we need a few other bits

• the genemap should move/zoom along with the sequence graph
• the elements should shrink. They are much wider than one base/one codon and often overlap. when zooming, this overlap should decrease.

I am wondering whether a mouse-drag-rectangle and pan would be useful.

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Name	Status	Preview	Updated
nextclade	✅ Ready (Inspect)	Visit Preview	Jun 24, 2022 at 9:34PM (UTC)